diff --git a/db/migrate/20180206000000_change_user_id_nonnullable.rb b/db/migrate/20180206000000_change_user_id_nonnullable.rb
index 4eecb6154..2d2cf20d3 100644
--- a/db/migrate/20180206000000_change_user_id_nonnullable.rb
+++ b/db/migrate/20180206000000_change_user_id_nonnullable.rb
@@ -1,6 +1,8 @@
 class ChangeUserIdNonnullable < ActiveRecord::Migration[5.1]
   def change
-    change_column_null :invites, :user_id, false
-    change_column_null :web_settings, :user_id, false
+    safety_assured do
+      change_column_null :invites, :user_id, false
+      change_column_null :web_settings, :user_id, false
+    end
   end
 end
diff --git a/db/migrate/20191031163205_change_list_account_follow_nullable.rb b/db/migrate/20191031163205_change_list_account_follow_nullable.rb
index ff8911546..65ff93365 100644
--- a/db/migrate/20191031163205_change_list_account_follow_nullable.rb
+++ b/db/migrate/20191031163205_change_list_account_follow_nullable.rb
@@ -1,5 +1,7 @@
 class ChangeListAccountFollowNullable < ActiveRecord::Migration[5.1]
   def change
-    change_column_null :list_accounts, :follow_id, true
+    safety_assured do
+      change_column_null :list_accounts, :follow_id, true
+    end
   end
 end